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A Review of Distress and Roughness Performance Models in Nova Scotia's Pavement Management System

Thu, 03/29/2018 - 21:37
A Review of Distress and Roughness Performance Models in Nova Scotia's Pavement Management System
by Hegazi,M; Marlin,A; Whieley-Lagace,L.
2017.
Proceedings of the Sixth-Second Annual Conference of the Canadian Technical Asphalt Association (CTAA): Halifax, Nova Scotia.
CA6 AIH___ 2017P09 - MAIN


Nova Scotia Transportation and Infrastructure Renewal (NSTIR) implemented its pavement management system (Highway Pavement Management Application or HPMA) in 2008. NSTIR conducts annual pavement condition surveys on their highway network. Data collected includes International Roughness Index (IRI), which is used to calculate a Roughness Index (RI). Surface distress data is also collected to calculate a Distress Index (DI). The RI and DI are combined into an overall Pavement Quality Index (PQI). In 2016, NSTIR initiated a project to review their pavement prediction models. Differences in historical data trends were noted during the initial model review. These differences were thought to be a result of technological advancements in data collection equipment. The study examined the existing roughness and distress indices to determine if and/or how changes in data collection technology have impacted the measured pavement condition. The investigation included a review of the historical roughness and distress data. Based on this data review, changes were made to the roughness and distress models to better reflect current NSTIR data and conditions. A feedback analysis was then conducted on the prediction models to conduct performance modeling on the HPMA. This paper details the data investigation and updated models.

Detailed Evaluation of Select CIR Projects in Alberta

Thu, 03/29/2018 - 21:37
Detailed Evaluation of Select CIR Projects in Alberta
by Sharma,V; Johnston,A; McMillan,C; Khan,A; Grell,D.
2017.
Proceedings of the Sixth-Second Annual Conference of the Canadian Technical Asphalt Association (CTAA): Halifax, Nova Scotia.
CA6 AIH___ 2017P08 - MAIN


Alberta Transportation has completed rehabilitation of a number of highway sections using Cold In-place Recycling (CIR) and Full Depth Reclamation (FDR) over the years. In order to better understand the mechanism responsible for the formation of transverse cracks (specifically to see if transverse cracks are reflecting from the underlying pavement) and the susceptibility of the recycled material to moisture induced damage, Alberta Transportation retained Tetra Tech to undertake pavement inspections and analysis of selected projects rehabilitated using CIR and FDR. A total of five highway segments rehabilitated with CIR and one highway segment rehabilitated with FDR were included in the study. The study included a review of background information, visual crack mapping, pavement inspection using Ground Penetrating Radar, asphalt pavement coring, determination of moisture content in the CIR portion of the cores, and visual assessment of the cores to identify the progression and type of cracks. The key objectives were to investigate the performance of the pavements rehabilitated with CIR in terms of transverse crack formation and moisture susceptibility. This paper discusses the completed evaluation and findings from the study and further expands on Alberta Transportation’s experience with CIR, as presented at the 2016 CTAA Conference.

RAP Paving - British Columbia Perspective

Thu, 03/29/2018 - 21:37
RAP Paving - British Columbia Perspective
by Sharma,V; Johnston,L; Hogg,B; Schmidt,A; Van Reekum,A.
2017.
Proceedings of the Sixth-Second Annual Conference of the Canadian Technical Asphalt Association (CTAA): Halifax, Nova Scotia.
CA6 AIH___ 2017P07 - MAIN


The British Columbia Ministry of Transportation and Infrastructure (MoTI) has been using 100 percent Reclaimed Asphalt Pavement (RAP) to pave numerous side roads in its network for more than 15 years with mixed results. The RAP is typically transported off site and recycled by adding a rejuvenator and processing the material through a pugmill. The cold recycled mix is then transported to site and placed using conventional paving equipment as a wearing surface – a surfacing layer of Hot Mix Asphalt (HMA) is not placed. Although the BC MoTI has been using this procedure for over a decade, no study to evaluate the addition rate of the rejuvenator, mix design, recycling process, or testing to determine the quality of the recycled mix was ever completed. The crushed granular equivalency or structural layer coefficient of the recycled mix was also never developed. This paper will document the findings of a laboratory program undertaken to evaluate the optimum addition rate of the rejuvenator, curing period prior to the placement of the recycled mix, and compaction criteria, as well as the structural layer coefficient and crushed granular equivalency of the recycled RAP. A case history of several previously completed projects using cold recycled RAP pavement are also presented.

Creating Economical and Well-Performing Binders via Modification by Epoxidized Plant-derived Oil Materials

Thu, 03/29/2018 - 21:37
Creating Economical and Well-Performing Binders via Modification by Epoxidized Plant-derived Oil Materials
by Podolsky,JH; Hernandez,N; Williams,RC; Cochran,EW.
2017.
Proceedings of the Sixth-Second Annual Conference of the Canadian Technical Asphalt Association (CTAA): Halifax, Nova Scotia.
CA6 AIH___ 2017P06 - MAIN


Asphalt binders produced at refineries are becoming stiffer due to an ever-increasing demand for more expensive lighter and heavier fraction products such as gasoline, jet fuel, and lube oils. To increase output of lighter fractions and heavy gas oils, refineries have gone through upgrades producing higher amounts of stiffer asphalt binders such as Vacuum Distillation (VD) tower, Solvent De-Asphalting (SDA), and Residuum Oil Super critical Extraction (ROSE) unit bottoms. Materials used to soften/repair stiff asphalt binders are known as fluxes. Through recent work at Iowa State University, great potential was seen for epoxidized plant oil materials as fluxes/rejuvenators. Within this work two epoxidized plant oil products derived from soybeans, EBS and EMS were manufactured and used for modifying three stiff asphalt binders produced from VD tower, SDA and ROSE units. A full Superpave binder investigation found that improvement in low temperature performance was greater than improvement in high temperature performance for the SD and ROSE unit bottoms when using either EBS or EMS. It was also found that substantial decreases in costs, fuel usage, and emissions could be gained through the use of EBS and EMS in the production of asphalt mix.

Mixture Design and Field Experience: Coloured Hot Mix Asphalt on Bus Rapid Transit (BRT) Lanes in Ontario

Thu, 03/29/2018 - 21:37
Mixture Design and Field Experience: Coloured Hot Mix Asphalt on Bus Rapid Transit (BRT) Lanes in Ontario
by Varamini,S; Esenwa,M; Tighe,SL; Farashah.MK; Moore,T.
2017.
Proceedings of the Sixth-Second Annual Conference of the Canadian Technical Asphalt Association (CTAA): Halifax, Nova Scotia.
CA6 AIH___ 2017P05 - MAIN


The Regional Municipality of York, in collaboration with Metrolinx (an agency of the Government of Ontario), has implemented Bus Rapid Transit (BRT) lanes along the three most heavily travelled roads in York Region. To enhance visibility and assist motorists when navigating this new transit system, a special red-coloured asphalt mixture was employed as a surface layer. The colour was achieved by using a selected aggregate bland, colouring pigment, and specially formulated asphalt mixture. This paper provides information on steps employed in the design of coloured asphalt mixture such as: 1) selection of performance graded asphalt cement suitable for the Region’s climatic conditions and traffic loadings, 2) designing an aggregate blend to match the desired colour, ) performing a volumetric analysis for the special Hot Mix Asphalt to meet physical requirements of Superpave 12.5 FC2, and 4) performance testing to capture the impact of pigment on the mixture’s strength and durability at different in-service temperatures. Performance testing was performed at the Centre for Pavement and Transportation Technology located at the University of Waterloo. Production and paving experience with the coloured asphalt mix are also included in this paper, as well as field performance in terms of manual and automated distress survey.

Regina Bypass Project's Innovative Asphalt Pavement Structures

Thu, 03/29/2018 - 21:37
Regina Bypass Project's Innovative Asphalt Pavement Structures
by Proteau,M; Pouteau,B; Berrada,K; LeBec,S; Heath,D.
2017.
Proceedings of the Sixth-Second Annual Conference of the Canadian Technical Asphalt Association (CTAA): Halifax, Nova Scotia.
CA6 AIH___ 2017P04 - MAIN


Currently in progress, the “Regina Bypass” highway project involves the construction of approximately 45 km of a new four-lane highway (greenfield), the rehabilitation of more than 18 km of Highway 1 (brownfield), and 5 km of reinforcement works on an existing section. The project is being realized using a “Design-Build-Finance-Operate-and-Maintain” (DBFOM) approach and it will be operated by the concessioners group until late October 2049. Taking into account the specific physical and climatic constraints involved, as well as the concession’s duration, flexible pavements have been designed using several innovative concepts such as a mechanistic pavement design approach to the structural pavement design, the use of engineered asphalt mixes, the use of on-site recycling process for existing sections, and the installation of performance monitoring stations. This article provides a summary of the numerous laboratory tests required for the study of the engineered asphalt mix formulations specifically developed for this project, and it describes the follow-up program that will measure their performance with time.

Impacts of Flooding on Asphalt Pavements under Climate Change

Thu, 03/29/2018 - 21:37
Impacts of Flooding on Asphalt Pavements under Climate Change
by Lu,D; Tighe,SL; Xie,WC.
2017.
Proceedings of the Sixth-Second Annual Conference of the Canadian Technical Asphalt Association (CTAA): Halifax, Nova Scotia.
CA6 AIH___ 2017P03 - MAIN


Flooding has been identified as the most frequently occurring natural hazard in Canada. Extreme weather events, such as floods and extreme precipitation events, are increasing in intensity and frequency under climate change. The impact of flooding on asphalt pavements has become a rising concern, since pavements are designed based on historical data, which do not adequately reflect current and future climate. Therefore a comprehensive understanding of the flooding impacts o pavements is of great importance for improving their resilience. The objective of this study is to establish an assessment framework for the impacts of flooding on asphalt pavements through fragility analysis, and conduct case study to illustrate the approach. Flood characteristics, pavement damage patterns, damage components, and performance impact factors are investigated. Thirty-six extreme precipitation scenarios with various magnitudes, durations, and numbers of event cycles are loaded to two typical asphalt pavement structures in Southern Ontario by using MEPDG. Then, a probabilistic pavement fragility modeling method is developed for generating fragility functions, which integrate flood hazards, pavement structure, pavement performance, and damage states. Results show that the loss of pavement life is not negligible due to extreme events. Fragility functions and curves are able to demonstrate the probability of exceeding certain pavement damage given flood hazards.

Base Asphalt Variability: An Opportunity for the Development of Innovative Characterization Approaches

Thu, 03/29/2018 - 21:37
Base Asphalt Variability: An Opportunity for the Development of Innovative Characterization Approaches
by Delfosse,F; PLanche,JP; Largeaud,S; Drouadaine,I; Turner,F.
2017.
Proceedings of the Sixth-Second Annual Conference of the Canadian Technical Asphalt Association (CTAA): Halifax, Nova Scotia.
CA6 AIH___ 2017P02 - MAIN


American and European refiners have been going through phases of revamping and rationalization to maximize the flexibility in crude oil supply while matching their production models and refining tools. For users of asphalt, this has created concerns about the quality and consistency of the delivered asphalt binders, especially as the current specifications appear insufficient to ensure satisfactory performance of the finished products. In this context, the search for relationships and correlations between asphalt properties and the performance of the asphalt mixtures and the pavement has become very relevant. The study presented here was dedicated to identifying and quantifying such relationships. It focused on asphalt mixes made with unmodified asphalts. It was based on a standard mix design with one type of aggregate, and involved 14 paving grade asphalts from various origins. The characterization of asphalt mixes covered various performance characteristics from resistance to rutting and fatigue to thermal cracking. The compositional analysis of binders included the most advanced fractionation method SAR-AD™ and a chemometrics analysis using a new software to identify and develop the correlations. Both were developed by the Western Research Institute (WRI). Significant correlations were found tying binder chemical composition metrics to binder mechanical characteristics to asphalt mix characteristics.

Managing the Transition to Driverless Road Freight Transport

Thu, 03/01/2018 - 16:45
Managing the Transition to Driverless Road Freight Transport
by Veryard,D.
2017.
ZZ IEM_22 2017M17 - INTERNET


This report explores how a transition to driverless trucks could happen. Reduced reliance on humans to move road freight offers many benefits. It also threatens to disrupt the careers and lives of millions of professional truck drivers. Based on different scenarios for the large-scale introduction of automated road freight transport, this study makes recommendations to help governments manage potential disruption and ensure a just transition for affected drivers.

Guide de gestion des charges pour les chaussées à faible capacite

Fri, 02/16/2018 - 21:27
Guide de gestion des charges pour les chaussées à faible capacite
by St. Michel,G; Reggin,A; Kavanagh,L.
2017.
CA6 ARH_90 2017L55Z - MAIN


Le Guide de gestion des charges pour les chaussées à faible capacité fournit une synthèse de pratiques canadiennes et internationales pour gérer les structures de chaussée à faible capacité dans des climats nordiques. Le guide inclut une série de pratiques exemplaires recommandées pour gérer ces chaussées en période de gel et de dégel ainsi que la gestion des chaussées tout au cours de l’année. Une base économique pour effectuer des décisions en matière de gestion des charges pour les chaussées à faible capacité est présentée dans le Guide. Le document renferme un cadre de soutien pour la prise de décision, qui peut être adapté pour toute administration routière canadienne afin de les aider à prendre des décisions économiquement justifiées et de restreindre les charges sur les structures de chaussée à faible capacité.

Lignes directrices nationales sur la sécurité en zone de travaux routiers au Canada

Fri, 02/16/2018 - 21:27
Lignes directrices nationales sur la sécurité en zone de travaux routiers au Canada
by Rempel,G; Montufar,J; Patmore,K; Bahar,G; Smiley,A.
2016.
CA6 ARH_60 2016W59Z - MAIN


Il est nécessaire d’élaborer une source nationale de lignes directrices pour venir en aide aux organismes canadiens et à leurs entrepreneurs qui doivent créer des zones de travaux routiers sécuritaires pour les travailleurs et le grand public (une attention particulière devant être accordée aux usagers vulnérables de la route). Bien que ces lignes directrices doivent promouvoir des normes standard, elles doivent aussi demeurer flexibles pour tenir compte des facteurs politiques, législatifs et fiscaux uniques à chaque administration gouvernementale et reconnaître les différents codes de la route des provinces. De plus, les lignes directrices doivent être sensibles aux pratiques en zone de travaux routiers dans les États américains à proximité, vu l’interconnectivité des réseaux de transport canadiens et américains. Ce projet a donc pour but l’élaboration de lignes directrices encourageant l’utilisation de pratiques cohérentes au Canada en matière de zones de travaux routiers pour les routes de classifications différentes et en milieux différents (rural/urbain/suburbain, été/hiver, jour/nuit, etc.), les vitesses d’exploitation typiques (sans zone de travaux), les vitesses d’exploitation souhaitables (dans une zone de travaux – travailleurs sur place ou non), les débits et la composition de la circulation (par ex., les motos, véhicules commerciaux, etc.), l’âge des groupes d’usagers, l’aménagement du territoire adjacent, les conditions temporaires et variables de la chaussée (par ex., le frottement des pneus et la surface de contact avec des surfaces différentes pour les automobiles, les scooters, les motocyclettes, etc.), de même que la longueur et la durée de la zone de travaux routiers. La charge de travail des usagers de la route (dont les conducteurs et les usagers vulnérables de la route) ainsi que les attentes feront partie des lignes directrices. Les deux tâches principales du projet sont les suivantes : a) définir et résoudre les lacunes en matière de pratiques au Canada; et b) concevoir un ouvrage de référence encourageant l’uniformité nationale en ce qui concerne les usagers vulnérables de la route, la planification de la gestion, la gestion et la documentation des incidents, les audits de sécurité routière en zone de travaux (avant et pendant les activités dans la zone de travaux), ainsi que les détours et la gestion des actifs (dont l’accommodement des usagers vulnérables de la route). On s’attend à ce que ce document encourage une pratique plus uniforme en matière de sécurité en zone de travaux routiers au Canada dans différentes conditions d’exploitation. Ces lignes directrices fourniront des outils additionnels qui contribueront à une communication claire et uniforme aux usagers de la route en zones de travaux routiers. La pratique uniforme jette les bases sur lesquelles reposent les attentes des usagers de la route dans les zones de travaux routiers et leur habileté à répondre de façon appropriée selon leur expérience dans des situations semblables. La sécurité en zone de travaux routiers devrait s’améliorer à mesure que le contenu des présentes lignes directrices sera adopté et intégré aux pratiques municipales et provinciales à la grandeur du pays.

Canadian Guide to Traffic Calming

Fri, 02/16/2018 - 21:27
Canadian Guide to Traffic Calming
by Solomon,H; Malone,B; Garcia,J; Bottesini,G; Hoeun,S; Chartier,G.
Second Edition.
2018.
CA6 ARH_65 2018C13 - MAIN


The Canadian Guide to Traffic Calming presents traffic calming as a method to reduce the speed and/or volume of non-local traffic infiltrating into neighbourhoods. The Guide explains principles of traffic calming, suggests a process for introducing and implementing traffic calming, and describes the applicability, effectiveness, and design principle for a wide range of traffic calming devices. The devices are categorized in terms of vertical deflection, horizontal deflection, roadway narrowing, surface treatment, pavement markings, access restriction, gateways, enforcement, education, shared space, and emerging technologies and measures.

Author’s Closure: Comments on "Longitudinal Thermal Cracking Phenomenon: Thermal Imaging Detection and Laboratory Case Studies"

Mon, 02/05/2018 - 21:15
Author’s Closure: Comments on "Longitudinal Thermal Cracking Phenomenon: Thermal Imaging Detection and Laboratory Case Studies"
by Lavoie,M.
2017.
Proceedings of the Sixth-Second Annual Conference of the Canadian Technical Asphalt Association (CTAA): Halifax, Nova Scotia.
CA6 AIH___ 2017P28 - MAIN


The paper provides final comments from the original lead author of the paper entitled "Longitudinal Thermal Cracking Phenomenon: Thermal Imaging Detection and Laboratory Case Studies," which was published in the proceedings of the CTAA 61st Annual Conference. The author of the original paper would like to acknowledge the detailed response submitted by Mr. Brown, Consultant Engineer. The comments make it possible to revive the discussions on the importance of improving the homogeneity of asphalt laying. The definition criterion of the Ministere des Transports, de la Mobilite durable et de l’Electrification des transports (MTMDET) concerning thermal streaks includes the therm “thermal” with reference to the type of measure used, regardless of the type of segregation that generates this thermal signature. Since the defects in the distribution of the asphalt are not easily identifiable, thermal imaging, allowing the detection of thermal streaks and the possibility of seeing the effects of paver’s adjustments, is the ideal tool to reduce risks of longitudinal cracking in asphalt pavements.

Discussion Paper: Comments on "Longitudinal Thermal Cracking Phenomenon: Thermal Imaging Detection and Laboratory Case Studies"

Mon, 02/05/2018 - 21:04
Discussion Paper: Comments on "Longitudinal Thermal Cracking Phenomenon: Thermal Imaging Detection and Laboratory Case Studies"
by Brown,A.
2017.
Proceedings of the Sixth-Second Annual Conference of the Canadian Technical Asphalt Association (CTAA): Halifax, Nova Scotia.
CA6 AIH___ 2017P27 - MAIN


The authors present a very complete paper with excellent laboratory data on the properties of a physically segregated mix and point out the problems associated segregated mix in terms of performance. They have also shown that non-destructive thermal imaging carried out as the mat is laid can effectively locate physical segregation. However, type of segregation they highlight in this paper is not related to the temperature of the mix. In this Author’s opinion, this is physical segregation caused by the irregularities in the flow of material under the screed. It can be detected with thermal imagery but it cannot be resolved or prevented by the techniques used to address thermal segregation.

Paver la voie: technologie et le futur du véhicule automatisé.

Fri, 02/02/2018 - 20:33
Paver la voie: technologie et le futur du véhicule automatisé.
Le Comité sénatorial permanent des transports et des communications.
2018.
CA1 AA_100 2018D61Z - INTERNET


À la demande du ministre des Transports, le Comité sénatorial permanent des transports et des communications a mené une étude intitulée « La technologie des véhicules automatisés et son avenir : Paver la voie » portant sur les questions techniques et réglementaires liées à l’arrivée des véhicules branchés et automatisés (c.-à-d. sans conducteur). Le Comité a entendu 78 témoins venant du Canada et des États-Unis, a reçu un bon nombre de mémoires écrits de la part des différents secteurs touchés et a assisté à de nombreuses démonstrations de cette technologie qui évolue rapidement. Le Comité a formulé 16 recommandations à l’intention du gouvernement fédéral. Nous croyons que ces recommandations contribueront à établir une stratégie nationale coordonnée sur les véhicules automatisés et branchés.

Driving Change: Technology and the future of the automated vehicle

Fri, 02/02/2018 - 20:25
Driving Change: Technology and the future of the automated vehicle
Senate Standing Committee on Transport and Communications.
2018.
CA1 AA_100 2018D61 - INTERNET


At the request of the Minister of Transport, the Standing Senate Committee on Transport and Communications undertook this study, “Driving Change: Technology and the Future of the Automated Vehicle”, on the regulatory and technical issues related to the deployment of automated (i.e. driverless) and connected vehicles. The Committee heard from over 78 witnesses from across Canada and the United States, received a number of written submissions from various sectors involved, and participated in many impressive demonstrations of this quickly developing technology. The Committee is making 16 recommendations to the federal government, recommendations we believe will help build a coordinated national strategy on automated and connected vehicles.

Guidelines for Defining and Measuring Urban Congestion

Mon, 01/29/2018 - 21:05
Guidelines for Defining and Measuring Urban Congestion
by Hadayeghi,A; Izadpanah,P; Salek,S; Omrani,R; Hellinga,B.
2017.
CA6 ARH127 2017D25 - MAIN


Traffic congestion has become a major challenge in most urban areas. In recent years, the development of measures to mitigate traffic congestion has become a priority task for many road agencies. The objectives of the guidelines were to develop approaches for defining and measuring traffic congestion and identifying performance measures (indices) to quantify congestion as well as to provide guidance on how to use different data sources for measuring congestion and presenting traffic congestion information. The identification of congestion and its characteristics was the first step towards selecting appropriate mitigation measures. Based on the findings of the literature and jurisdictional survey, traffic congestion was defined and a range of performance metrics to measure and monitor traffic congestion were identified. The long list of indices adopted from the literature was evaluated against a number of criteria. The document provides a correlation matrix to assist practitioners in selecting the appropriate data collection method for measuring congestion in different applications. The guidelines also provide recommendations for selecting various tools to present congestion indices as well as a decision support tool to assist users in selecting the most appropriate congestion indices, data collection techniques, and visualization tools for their applications.

Application Guidelines for Speed Display Devices

Tue, 01/23/2018 - 18:12
Application Guidelines for Speed Display Devices
by Ermatinger,V; Guglielmino,M; Kellner,S; Kozak,DA; Lovicsek,M; Otten-Andrew,M.
2017.
CA6 ARH_65 2017A63 - MAIN


Dynamic speed display signs are being used in many jurisdictions across Canada. The devices display the speed of passing vehicles, typically along with a sign showing the posted speed limit. Intended to increase driver awareness of speed limits and to provide instant feedback to motorists by displaying the actual speed being travelled, the devices have been found to be effective shortly following installation. The Application Guidelines for Speed Display Devices were developed to establish best practices and guidance for speed display devices design and application in the Canadian context for a variety of uses. The Guidelines enable and encourage uniformity in application of devices throughout Canada, and are intended to be a complementary detailed reference document, for use in conjunction with the Manual of Uniform Traffic Control Devices for Canada (MUTCDC).

Guide canadien de conception des carrefours giratoires

Tue, 01/23/2018 - 17:11
Guide canadien de conception des carrefours giratoires
by Chartier,G; Eichenbaum,T; Jacobson,M; MacDonald,M; Ridding,C; Rodegerdts,L; Skene,M.
2017.
CA6 ARH_85 2017R52Z - MAIN


Au cours des dernières années, une prolifération de carrefours giratoires a été observée partout au Canada. À ce jour, il n’existe aucune source unique traitant de la conception, de la construction, du fonctionnement et de l’entretien des carrefours giratoires à l’intention des professionnels canadiens. Chaque région du pays a choisi de s’inspirer de différentes sources, y compris des lignes directrices d’autres pays. Le Guide canadien de conception de carrefours giratoires a pour objet de fournir des renseignements et des conseils sur la planification, la conception, la construction, le fonctionnement, l’entretien et la sécurité des carrefours giratoires au Canada. Le guide sert de document d’accompagnement au Guide canadien de conception géométrique des routes de l’Association des transports du Canada et fournit des directives spécifiques à l’utilisation et à la conception de carrefours giratoires.

Author's Closure: Comments on "Physical Hardening in Asphalt"

Fri, 01/05/2018 - 21:23
Author's Closure: Comments on "Physical Hardening in Asphalt"
by Hesp,SAM.
2017.
Proceedings of the Sixth-Second Annual Conference of the Canadian Technical Asphalt Association (CTAA): Halifax, Nova Scotia.
CA6 AIH___ 2017P26 - MAIN


The authors of the original 2015 CTAA manuscript “Physical Hardening in Asphalt” wish to acknowledge the response paper submitted by Mr. Alexander (Sandy) Brown. We wish to thank Mr. Brown for his extensive analysis of the weather data surrounding the early 2014 and 2015 cracking incidents in the Battersea Road, Kingston contract of 2009. As the lead author of the original manuscript, and the person who prepared the Battersea Road case study for the 2015 Ottawa podium presentation, I wish to provide this Author’s Closure in response to the discussion prepared by Mr. Brown. I disagree with his conclusion that it would have been better to specify a regular PG -34 grade for the Battersea Road reconstruction. The LS-299 Double-Edge-Notched Tension (DENT) and LS-308 Extended Bending Beam Rheometer (ExBBR) tests and associated acceptance criteria will soon be used by a majority of user agencies in Ontario, and are gaining attention in the rest of Canada and abroad for their precision and results.

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